Collatz_unknown-termination.c

contents

/*
 * Date: 2012-02-12
 * Author: leike@informatik.uni-freiburg.de
 *
 * Termination unknown as of this date.
 */

extern int __VERIFIER_nondet_int(void);

int main()
{
	int y = __VERIFIER_nondet_int();
	while (y > 1) {
		if (y % 2 == 0) {
			y = y / 2;
		} else {
			y = 3*y + 1;
		}
	}
	return 0;
}

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